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Issue 31, 2014
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Plasmonic nanoparticle clusters with tunable plasmonic resonances in the visible spectral region

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Abstract

The seeded growth of poly(ethylene imine) – gold nanoparticle clusters enables the formation of particle assemblies with tunable optical properties. Clusters with increasing particle sizes, filling factors and assemblies consisting of PEI–gold–silver core shell particles can be synthesized in this way. Profound structural characterization is carried out via TEM imaging and FIB milling which allows visualizing the cross-section of the clusters. Determination of the optical properties was performed via UV-Vis spectroscopy and spectral dark field microscopy of individual particles. Additionally, numerical calculations were carried out based on the Mie theory. The results are in good agreement with the experimental findings and reveal the contribution of different multipoles to the spectra which cannot be resolved by UV-Vis spectroscopy in solution. The isotropic nature and adjustable properties of these clusters could render them versatile building blocks for metamaterials.

Graphical abstract: Plasmonic nanoparticle clusters with tunable plasmonic resonances in the visible spectral region

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Article information


Submitted
16 May 2014
Accepted
20 Jun 2014
First published
20 Jun 2014

J. Mater. Chem. C, 2014,2, 6415-6422
Article type
Paper

Plasmonic nanoparticle clusters with tunable plasmonic resonances in the visible spectral region

F. Kretschmer, M. Fruhnert, R. Geiss, U. Mansfeld, C. Höppener, S. Hoeppener, C. Rockstuhl, T. Pertsch and U. S. Schubert, J. Mater. Chem. C, 2014, 2, 6415
DOI: 10.1039/C4TC01018C

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